IE screws everything up

internet explorer apparently can't connect to this thing, everytime I try to open Elsword I get this

Server Error in '/Arc' Application.

Received an unexpected EOF or 0 bytes from the transport stream.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream.

Source Error:

Line 40:
Line 41:
Line 42: using (var writer = new System.IO.StreamWriter(objRequest.GetRequestStream()))
Line 43: {
Line 44: writer.Write(post_string, 0, post_string.Length);